Wilo IPL Notice De Montage Et De Mise En Service page 15

Faults
Pump does not
start or fails to
run
Pump runs at
reduced capacity
Pump makes
noise
If the fault cannot be remedied, please contact your local plumbing and
heating specialist or WILO customer services.
Installation and Operating Instructions Wilo-IPL
Possible cause
Pump seized
Loose terminals
Blown fuses/breakers
Faulty motor
Tripped overload relay (excessive
amp draw)
Incorrectly set trip relay (heaters) reset thermal overloads to name
Thermal overload are influenced
by excessive ambient tempera-
ture
Tripped PTC-relay
incorrect rotation
Discharge valve throttled too far
Speed too low
Air in suction pipe
insufficient inlet pressure
Faulty motor bearings
Impeller rubs on volute
Remedy
switch off power supply, take-off
pump head, remove obstruction;
if motor blocked, overhaul/
exchange motor/pump head
tighten all terminals
check fuses, replace/reset as
necessary
call service
throttle hydraulic flow rate down
to nominal at discharge side of
pump
plate full load current-value
Protect overloads from high
ambient temperatures
check motor and fan cover for
dirt/dust accumulation and clean
if necessary; check ambient tem-
perature and if necessary, ensure
an ambient temperature ≤ 105 °F
[40 °C] by forced ventilation.
check direction of rotation,
reverse if necessary
slowly open isolating valve
correct wrong terminal bridging
(Y in lieu ∆)
check and correct all possible
suction leaks
raise inlet pressure, ensure mini-
mum required inlet pressure at
suction port, check and if neces-
sary clean suction-side isolating
valve and strainer
Arrange for pump to be inspected
and, if necessary, to be repaired by
Wilo or other authorized service.
Test the contact between lantern
and pumphousing. Clean it, if
necessary.
English
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